"use strict"
const path = require("path")
const defaultSettings = require("./src/settings.js")

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || "vue Admin Template" // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528

const port = process.env.port || process.env.npm_config_port || 7777 // dev port
var cdn = { css: [], js: [] }
let externals = {}
const isProd = process.env.NODE_ENV === "production" // 判断是否是生产环境
if (isProd) {
  // 如果是生产环境 就排除打包 否则不排除
  externals = {
    //key(包名) // value(这个值 是 需要在CDN中获取js, 相当于 获取的js中 的该包的全局的对象的名字)
    vue: "Vue", // 后面的名字不能随便起 应该是 js中的全局对象名
    "element-ui": "ELEMENT", // 都是js中全局定义的
    xlsx: "XLSX" // 都是js中全局定义的
  }
  cdn = {
    css: [
      "https://cdn.bootcdn.net/ajax/libs/element-ui/2.13.2/theme-chalk/index.css" // 提前引入elementUI样式
    ], // 放置css文件目录
    js: [
      "https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.min.js", // vuejs
      "https://cdn.bootcdn.net/ajax/libs/element-ui/2.13.2/index.js", // element
      "https://cdn.jsdelivr.net/npm/xlsx@0.16.6/dist/xlsx.full.min.js", // xlsx 相关
      "https://cdn.jsdelivr.net/npm/xlsx@0.16.6/dist/jszip.min.js" // xlsx 相关
    ] // 放置js文件目录
  }
}

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: "./",
  outputDir: "dist",
  assetsDir: "static",
  lintOnSave: process.env.NODE_ENV === "development",
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      "/api": {
        //  请求地址中必须要有 /api  的才会生效
        target: "http://ihrm-java.itheima.net", //  就是需要请求的地址 http://localhost:9988=>http://ihrm-java.itheima.net
        changeOrigin: true
        // pathRewrite:{
        //   "^/api":''  //  www.baidu.com/api/qq ===www.baidu.com/qq
        // }
      }
    }
    //before: require("./mock/mock-server.js"),
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        "@": resolve("src")
      }
    },
    externals: externals
  },
  chainWebpack(config) {
    config.plugin("html").tap(args => {
      args[0].cdn = cdn
      return args
    })
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin("preload").tap(() => [
      {
        rel: "preload",
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: "initial"
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete("prefetch")

    // set svg-sprite-loader
    config.module
      .rule("svg")
      .exclude.add(resolve("src/icons"))
      .end()
    config.module
      .rule("icons")
      .test(/\.svg$/)
      .include.add(resolve("src/icons"))
      .end()
      .use("svg-sprite-loader")
      .loader("svg-sprite-loader")
      .options({
        symbolId: "icon-[name]"
      })
      .end()

    config.when(process.env.NODE_ENV !== "development", config => {
      config
        .plugin("ScriptExtHtmlWebpackPlugin")
        .after("html")
        .use("script-ext-html-webpack-plugin", [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/
          }
        ])
        .end()
      config.optimization.splitChunks({
        chunks: "all",
        cacheGroups: {
          libs: {
            name: "chunk-libs",
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: "initial" // only package third parties that are initially dependent
          },
          elementUI: {
            name: "chunk-elementUI", // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: "chunk-commons",
            test: resolve("src/components"), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk("single")
    })
  }
}
